When a quantity is increased or decreased, what PERCENT describes the
original or starting value?

100%

Step-by-step explanation:

The percentage that describes the original value we are calculating from is 100%

This represents the original value that we are working with.

For example if we are to decrease by 10%, it means we are to be left with 90%

If also we are to increase by 10%, it means that we are to be left with 110%

to find the total number of combinations, multiply the quantity of each item by each other:

2 pairs of shoes x 3 pairs of shorts = 6 different combinations.